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This is the recommended non-destructive method to give thickness to a flat plane. : Click on your plane in Object Mode.

: Go to the Modifier Properties tab (wrench icon) and select Solidify from the "Generate" column. 124793

: In Edit Mode, hold Alt and click an edge of the open boundary. This is the recommended non-destructive method to give

: Select the plane and press Tab to enter Edit Mode. Select All : Press A to select all vertices/faces. 124793